ACPI / MMC: PM: Unify fixing up device power

Introduce acpi_device_fix_up_power_extended() for fixing up power of
a device having an ACPI companion in a manner that takes the device's
children into account and make the MMC code use it in two places
instead of walking the list of the device ACPI companion's children
directly.

This will help to eliminate the children list head from struct
acpi_device as it is redundant and it is used in questionable ways
in some places (in particular, locking is needed for walking the
list pointed to it safely, but it is often missing).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 130b5f4a50a3..9dce1245689c 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -369,6 +369,28 @@ int acpi_device_fix_up_power(struct acpi_device *device)
 }
 EXPORT_SYMBOL_GPL(acpi_device_fix_up_power);
 
+static int fix_up_power_if_applicable(struct acpi_device *adev, void *not_used)
+{
+	if (adev->status.present && adev->status.enabled)
+		acpi_device_fix_up_power(adev);
+
+	return 0;
+}
+
+/**
+ * acpi_device_fix_up_power_extended - Force device and its children into D0.
+ * @adev: Parent device object whose power state is to be fixed up.
+ *
+ * Call acpi_device_fix_up_power() for @adev and its children so long as they
+ * are reported as present and enabled.
+ */
+void acpi_device_fix_up_power_extended(struct acpi_device *adev)
+{
+	acpi_device_fix_up_power(adev);
+	acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended);
+
 int acpi_device_update_power(struct acpi_device *device, int *state_p)
 {
 	int state;